[
ABSTRAKLapangan panasbumi Wayang Windu (WW) merupakan bagian dari busur
gunungapi Kuarter Jawa Barat, terdiri dari komplek gunungapi dan dome
Malabar, Bedil, Wayang, dan Windu yang berkontribusi pada pembentukan
sistem panasbumi. Tipe fluida terdiri dari dua-fasa di area Selatan dan
kecenderungan dominasi uap di Utara dengan kisaran temperatur reservoir 240
hingga 300 0C. Segmentasi secara hidrologi dibuat berdasarkan karakterisasi
tekanan reservoir dari 40 di Utara hingga 80 bar di Selatan pada kondisi awal.
Setelah melewati masa produksi lebih dari 13 tahun, telah terjadi perubahan di
reservoir yang terlihat baik pada parameter fisik maupun kimia. Kegiatan
monitoring geokimia dan microravity telah diterapkan di WW untuk mencatat
setiap perubahan di reservoir dan sebagai mitigasi masalah yang timbul selama
eksploitasi ataupun untuk pengenbangan selanjutnya. Respon kimiawi akibat
produksi digambarkan dalam perubahan area isokontur dari semua parameter
kimia yang terlihat jelas perubahannya di area Utara. Proses di reservoir seperti
kondensasi teridentifikasi melalui kenaikan CO2/H2S sebagai respon dari
penurunan H2S, serta efek dilusi minor teridentifikasi melalui penurunan klorida.
Indikasi kehadiran brine dibawah zona dominasi uap di Utara dicirikan oleh
kenaikan boron, klorida, dan silika. Secara singkat, evolusi fluida yang terjadi di
WW akibat proses produksi yaitu terjadinya warm recharge atau brine carryover
di sumur kering atau zona dominasi uap di Utara, serta perubahan fasa fluida dari
dua-fasa menjadi dominasi liquid pada zona dua-fasa di Selatan. Evolusi fisik
selama proses produksi juga diamati dengan baik melalui pengukuran perubahan
gravity sebagai akibat dari perubahan saturasi liquid pada batuan hasil dari
ekstraksi fluida dari reservoir. Integrasi data evolusi fluida di WW selama
produksi dan aktivitas monitoring berkelanjutan telah memberikan manfaat
terhadap strategi sustainabilitas produksi dan strategi pengembangan.
ABSTRACTWayang Windu (WW) geothermal field is part of Quaternary volcanic arc
located in Western of Java Island. It consists of volcanic complex and domes of
Malabar, Bedil, Wayang, and Windu which contribute to geothermal system
formation. Fluid phase were dominantly of two-phase fluid in the Southern area
and likelihood of vapor dominated in the Northern area with temperature ranges
of 240 up to 3000C. Hydrological segmentation characterized by pressure ranging
from 40 to 85 bar at the North to southern part respectively at initial condition.
More than 13 year production, has led the reservoir to change and respond to
physical and chemical parameter. Geochemistry and microgravity monitoring has
been applied to record reservoir changes and mitigate problems during
exploitation or future development. Chemical respond related to production
impact decribed by change in isocontour area of all chemistry parameter seen in
northern part of the field. Reservoir processes such as condensation identified by
increasing CO2//H2S followed by decreased H2S, and minor dilution effect in
WW identified by decreased choride. Indication of brine existance beneath the
steam cap area in Northern wells, identified by increased boron, chloride, and
silica in some of dry steam wells. Fluid evolution due to production in WW
summarize as the process of warm recharge or brine carryover in dry steam wells,
and changing from two-phase fluid into liquid dominated is one of the evolution
happened in two-phase area in Southern area. Physical evolution during
production also monitored by well defined gravity change measurement as the
rock density change due to fluid extraction from reservoir. Data integration of the
fluid evolution in WW during production and continuous monitoring activity give
benefit to production sustainability strategy and future development area.;Wayang Windu (WW) geothermal field is part of Quaternary volcanic arc
located in Western of Java Island. It consists of volcanic complex and domes of
Malabar, Bedil, Wayang, and Windu which contribute to geothermal system
formation. Fluid phase were dominantly of two-phase fluid in the Southern area
and likelihood of vapor dominated in the Northern area with temperature ranges
of 240 up to 3000C. Hydrological segmentation characterized by pressure ranging
from 40 to 85 bar at the North to southern part respectively at initial condition.
More than 13 year production, has led the reservoir to change and respond to
physical and chemical parameter. Geochemistry and microgravity monitoring has
been applied to record reservoir changes and mitigate problems during
exploitation or future development. Chemical respond related to production
impact decribed by change in isocontour area of all chemistry parameter seen in
northern part of the field. Reservoir processes such as condensation identified by
increasing CO2//H2S followed by decreased H2S, and minor dilution effect in
WW identified by decreased choride. Indication of brine existance beneath the
steam cap area in Northern wells, identified by increased boron, chloride, and
silica in some of dry steam wells. Fluid evolution due to production in WW
summarize as the process of warm recharge or brine carryover in dry steam wells,
and changing from two-phase fluid into liquid dominated is one of the evolution
happened in two-phase area in Southern area. Physical evolution during
production also monitored by well defined gravity change measurement as the
rock density change due to fluid extraction from reservoir. Data integration of the
fluid evolution in WW during production and continuous monitoring activity give
benefit to production sustainability strategy and future development area.;Wayang Windu (WW) geothermal field is part of Quaternary volcanic arc
located in Western of Java Island. It consists of volcanic complex and domes of
Malabar, Bedil, Wayang, and Windu which contribute to geothermal system
formation. Fluid phase were dominantly of two-phase fluid in the Southern area
and likelihood of vapor dominated in the Northern area with temperature ranges
of 240 up to 3000C. Hydrological segmentation characterized by pressure ranging
from 40 to 85 bar at the North to southern part respectively at initial condition.
More than 13 year production, has led the reservoir to change and respond to
physical and chemical parameter. Geochemistry and microgravity monitoring has
been applied to record reservoir changes and mitigate problems during
exploitation or future development. Chemical respond related to production
impact decribed by change in isocontour area of all chemistry parameter seen in
northern part of the field. Reservoir processes such as condensation identified by
increasing CO2//H2S followed by decreased H2S, and minor dilution effect in
WW identified by decreased choride. Indication of brine existance beneath the
steam cap area in Northern wells, identified by increased boron, chloride, and
silica in some of dry steam wells. Fluid evolution due to production in WW
summarize as the process of warm recharge or brine carryover in dry steam wells,
and changing from two-phase fluid into liquid dominated is one of the evolution
happened in two-phase area in Southern area. Physical evolution during
production also monitored by well defined gravity change measurement as the
rock density change due to fluid extraction from reservoir. Data integration of the
fluid evolution in WW during production and continuous monitoring activity give
benefit to production sustainability strategy and future development area., Wayang Windu (WW) geothermal field is part of Quaternary volcanic arc
located in Western of Java Island. It consists of volcanic complex and domes of
Malabar, Bedil, Wayang, and Windu which contribute to geothermal system
formation. Fluid phase were dominantly of two-phase fluid in the Southern area
and likelihood of vapor dominated in the Northern area with temperature ranges
of 240 up to 3000C. Hydrological segmentation characterized by pressure ranging
from 40 to 85 bar at the North to southern part respectively at initial condition.
More than 13 year production, has led the reservoir to change and respond to
physical and chemical parameter. Geochemistry and microgravity monitoring has
been applied to record reservoir changes and mitigate problems during
exploitation or future development. Chemical respond related to production
impact decribed by change in isocontour area of all chemistry parameter seen in
northern part of the field. Reservoir processes such as condensation identified by
increasing CO2//H2S followed by decreased H2S, and minor dilution effect in
WW identified by decreased choride. Indication of brine existance beneath the
steam cap area in Northern wells, identified by increased boron, chloride, and
silica in some of dry steam wells. Fluid evolution due to production in WW
summarize as the process of warm recharge or brine carryover in dry steam wells,
and changing from two-phase fluid into liquid dominated is one of the evolution
happened in two-phase area in Southern area. Physical evolution during
production also monitored by well defined gravity change measurement as the
rock density change due to fluid extraction from reservoir. Data integration of the
fluid evolution in WW during production and continuous monitoring activity give
benefit to production sustainability strategy and future development area.]
T43399-dwiyogarani malik .pdf :: Unduh